Changing States Of Matter (Year 7 Physics)

The following test is covering 'Changing States Of Matter' for Year 7 Physics.

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Question 1

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What process changes a solid into a liquid?

What causes a substance to change states?

Which state of matter has particles that are tightly packed together?

What factor, aside from temperature, can cause a change in the state of matter?

What state of matter has particles that move freely, expanding indefinitely to fill any container?

What is the process in which a gas changes into a solid without existing in a liquid state?

What term describes the change from gas to liquid?